Need help 2008 Yamaha Big Bear 250

[Dee Morris]

I pulled it off and opened it up, it all looked clean. I'll pull it off again and spray it all out again

[Dee Morris]

Still working on the bear in between surgeries. The bear cranks but not starting. My boyfriend did spray carb cleaner into the air intake and we got a slight reaction of machine trying to start. At this point should I replace all hoses going in and out of the carb or could it be a point problem now? 

[MarkinAR]

If it fired on carb cleaner then it's a fuel delivery problem.  It really should run for a second or two on carb cleaner...if it doesn't do that, then I'd suspect fuel being an issue as well as intake in some fashion whether it's a bad intake boot, sticky valve, broken timing chain.  Lot of possibilities.

[davefrombc]

Spraying  carb cleaner into the intake  only  cleans the throat of the  carb and the manifold some .. To  clean the carb  you need to  disassemble it  and  clean  out  all the jets and passages .. Especially  look for some tiny drilled holes in the  jet tubes  that likely need to  be cleaned out  with very thin wire or a welder's  tip  cleaners .